Oh my, we never get that cold here. The coldest in the middle of the winter is about 10 degrees. So, the -5C would really destroy my body so used to the heat!
I hope that there is beauty in the cold.
The weather here is so strange, some days 30 degrees and then falling back to 15. I hope that the plants will cope with these changes, as such temperature fluctuations can cause some problems (such as mold on the leaves).